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$g(multiple words) should produce
<a href="http://www.google.com/search?q=multiple+words">
multiple words</a>. In other words, the spaces should
be URL encoded as pluses in the URL.

I spent some time looking into a fix. It doesn't seem
to be possible with a regex. See the thread I started at
http://regexadvice.com/forums/14513/ShowPost.aspx

My suggested fix.
$g(expr) ->
<a href="http://www.google.com/search?q=$h(${expr})">
${expr}</a>
where $h is a new kind of content filter, one that uses
a builtin function to URL encode the string.